Buffalo AirStation WHR-HP-G54 User Manual page 36

IP Filter (Add/Delete Basic Rules)
Get here by clicking on Add/Delete Basic
Rules (see page 35). You may choose which
of AirStation's preconfigured basic rules
are enabled or disabled. Active rules are
displayed with a green background, and
disabled rules are shown in red. Choose
the rules you want to use by clicking under
Operation. When your choices are complete,
click on Initialize.